The South Bend Tribune has the story here, with photo (may be blocked after a week or so).
The gist of the story is that the man was sitting along the East Race when a 14-year-old and a 17-year-old tried to steal his bike. While they struggled over it, the 17-year-old pulled the gun and supposedly shot the man in the wrist. The teens then ran off. They were later arrested and identified.
The man had a blue mountain bike, and the kids left behind their green BMX bike. No word on whether the BMX bike had been also stolen.
My personal take is that this will be an unfortunate downside as bikes gain popularity. Many cyclists already carry pepper spray, and I think I should probably add it to my usual ride kit, right along with a pump and a spare tube. Be safe out there!